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C. L. Gilbert C. W. Morgan 《Philosophical transactions of the Royal Society of London. Series B, Biological sciences》2010,365(1554):3023-3034
The high food prices experienced over recent years have led to the widespread view that food price volatility has increased. However, volatility has generally been lower over the two most recent decades than previously. Variability over the most recent period has been high but, with the important exception of rice, not out of line with historical experience. There is weak evidence that grains price volatility more generally may be increasing but it is too early to say. 相似文献
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